HI Charles,
Thanks for your questions.
The plants are mixed – some are healthy fat spears, and others are thin spears that go to ferny stage quite rapidly. The beetles like them all! I was planning to stop harvesting and let the crop go to the ferny stage, but am hesitating because of the infestation. (The asparagus bed was planted with crowns about 5 years ago).
We have had ample rain this spring, and I have also been watering the asparagus bed once a week, so it should not be too dry.
Cheers,